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Inventory (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following amounts (in thousands):
 
June 30, 2018
 
December 31, 2017
Parts and supplies
$
67,092

 
$
72,528

Work in progress
15,378

 
18,163

Inventory
$
82,470

 
$
90,691